DS90CR286 National Semiconductor, DS90CR286 Datasheet

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DS90CR286

Manufacturer Part Number
DS90CR286
Description
Manufacturer
National Semiconductor
Datasheet

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© 2000 National Semiconductor Corporation
DS90CR285/DS90CR286
+3.3V Rising Edge Data Strobe LVDS 28-Bit Channel
Link-66 MHz
General Description
The DS90CR285 transmitter converts 28 bits of LVCMOS/
LVTTL data into four LVDS (Low Voltage Differential Signal-
ing) data streams. A phase-locked transmit clock is transmit-
ted in parallel with the data streams over a fifth LVDS link.
Every cycle of the transmit clock 28 bits of input data are
sampled and transmitted. The DS90CR286 receiver con-
verts the LVDS data streams back into 28 bits of LVCMOS/
LVTTL data. At a transmit clock frequency of 66 MHz, 28 bits
of TTL data are transmitted at a rate of 462 Mbps per LVDS
data channel. Using a 66 MHz clock, the data throughput is
1.848 Gbit/s (231 Mbytes/s).
The multiplexing of the data lines provides a substantial
cable reduction. Long distance parallel single-ended buses
typically require a ground wire per active signal (and have
very limited noise rejection capability). Thus, for a 28-bit wide
data and one clock, up to 58 conductors are required. With
the Channel Link chipset as few as 11 conductors (4 data
pairs, 1 clock pair and a minimum of one ground) are
needed. This provides a 80% reduction in required cable
width, which provides a system cost savings, reduces con-
nector physical size and cost, and reduces shielding require-
ments due to the cables’ smaller form factor.
The 28 LVCMOS/LVTTL inputs can support a variety of
signal combinations. For example, seven 4-bit nibbles or
three 9-bit (byte + parity) and 1 control.
Block Diagrams
TRI-STATE
Order Number DS90CR285MTD or DS90CR285SLC
See NS Package Number MTD56 or SLC64A
®
is a registered trademark of National Semiconductor Corporation.
DS90CR285
DS012910
DS012910-1
Features
n Single +3.3V supply
n Chipset (Tx + Rx) power consumption
n Power-down mode (
n Up to 231 Megabytes/sec bandwidth
n Up to 1.848 Gbps data throughput
n Narrow bus reduces cable size
n 290 mV swing LVDS devices for low EMI
n +1V common mode range (around +1.2V)
n PLL requires no external components
n Both devices are offered in a Low profile 56-lead
n DS90CR285SLC is offered in a 64 ball, 0.8mm fine pitch
n Rising edge data strobe
n Compatible with TIA/EIA-644 LVDS standard
n ESD Rating
n Operating Temperature: −40˚C to +85˚C
TSSOP package
ball grid array (FBGA) package for use with the
DS90CR286ASLC
See NS Package Number MTD56
Order Number DS90CR286MTD
>
7 kV
<
DS90CR286
0.5 mW total)
<
250 mW (typ)
November 2000
www.national.com
DS012910-27

Related parts for DS90CR286

DS90CR286 Summary of contents

Page 1

... LVDS link. Every cycle of the transmit clock 28 bits of input data are sampled and transmitted. The DS90CR286 receiver con- verts the LVDS data streams back into 28 bits of LVCMOS/ LVTTL data transmit clock frequency of 66 MHz, 28 bits of TTL data are transmitted at a rate of 462 Mbps per LVDS data channel ...

Page 2

... Pin Diagrams for TSSOP Packages DS90CR285 Typical Application www.national.com DS012910-21 2 DS90CR286 DS012910-22 DS012910-23 ...

Page 3

... Maximum Package Power Dissipation DS90CR285MTD DS90CR285SLC DS90CR286MTD Package Derating: −0.3V to +4V DS90CR285MTD −0. 0.3V) CC DS90CR285SLC −0. 0.3V) CC DS90CR286MTD −0. 0.3V) ESD Rating CC −0. 0.3V) (HBM, 1 100 pF) CC Recommended Operating Continuous Conditions +150˚C −65˚C to +150˚C Supply Voltage (V +260˚C ...

Page 4

Electrical Characteristics Over recommended operating supply and temperature ranges unless otherwise specified Symbol Parameter TRANSMITTER SUPPLY CURRENT I Transmitter Supply Current CCTW Worst Case (with Loads) Transmitter Supply Current I CCTZ Power Down RECEIVER SUPPLY CURRENT I Receiver Supply Current ...

Page 5

Transmitter Switching Characteristics Over recommended operating supply and −40˚C to +85˚C ranges unless otherwise specified Symbol Parameter TPPos3 Transmitter Output Pulse Position for Bit3 TPPos4 Transmitter Output Pulse Position for Bit4 TPPos5 Transmitter Output Pulse Position for Bit5 TPPos6 Transmitter ...

Page 6

Receiver Switching Characteristics Over recommended operating supply and −40˚C to +85˚C ranges unless otherwise specified Symbol Receiver Input Strobe Position for Bit 0 (Note 6)( Figure 17 ) RSPos0 RSPos1 Receiver Input Strobe Position for Bit 1 RSPos2 Receiver Input ...

Page 7

... AC Timing Diagrams (Continued) DS012910-5 FIGURE 3. DS90CR286 (Receiver) CMOS/TTL Output Load and Transition Times FIGURE 4. DS90CR285 (Transmitter) Input Clock Transition Time Note 8: Measurements DIFF Note 9: TCCS measured between earliest and latest LVDS edges. Note 10: TxCLK Differential Low High Edge FIGURE 5. DS90CR285 (Transmitter) Channel-to-Channel Skew FIGURE 6 ...

Page 8

... AC Timing Diagrams FIGURE 7. DS90CR286 (Receiver) Setup/Hold and High/Low Times FIGURE 8. DS90CR285 (Transmitter) Clock In to Clock Out Delay FIGURE 9. DS90CR286 (Receiver) Clock In to Clock Out Delay FIGURE 10. DS90CR285 (Transmitter) Phase Lock Loop Set Time www.national.com (Continued) 8 DS012910-10 DS012910-11 DS012910-12 DS012910-13 ...

Page 9

... AC Timing Diagrams (Continued) FIGURE 11. DS90CR286 (Receiver) Phase Lock Loop Set Time FIGURE 12. Seven Bits of LVDS in Once Clock Cycle FIGURE 13. 28 ParalIeI TTL Data Inputs Mapped to LVDS Outputs DS012910-14 DS012910-15 9 DS012910-16 www.national.com ...

Page 10

AC Timing Diagrams FIGURE 16. Transmitter LVDS Output Pulse Position Measurement www.national.com (Continued) FIGURE 14. Transmitter Powerdown DeIay FIGURE 15. Receiver Powerdown Delay 10 DS012910-17 DS012910-18 DS012910-19 ...

Page 11

AC Timing Diagrams (Continued) FIGURE 17. Receiver LVDS Input Strobe Position 11 DS012910-28 www.national.com ...

Page 12

AC Timing Diagrams C — Setup and Hold Time (Internal data sampling window) defined by Rspos (receiver input strobe position) min and max Tppos — Transmitter output pulse position (min and max) RSKM Cable Skew (type, length) + Source Clock ...

Page 13

Pin Descriptions (Continued) DS90CR285 SLC64A (FBGA) Package Pin Summary — Channel Link Transmitter Pin Name I/O No. GND I 5 Ground pins for TTL inputs. PLL Power supply pin for PLL. CC PLL GND I 2 Ground ...

Page 14

... TxIN23 H1 TxIN9 H2 VCC H3 TxIN11 H4 TxIN14 H5 TxIN15 H6 TxIN18 H7 TxIN19 H8 TxIN20 G : Ground I : Input O : Output P : Power Connect DS90CR286 MTD56 (TSSOP) Package Pin Description — Channel Link Receiver Pin Name I/O No. RxIN RxIN− RxOUT O 28 RxCLK IN RxCLK IN− RxCLK OUT O ...

Page 15

... Pin Descriptions (Continued) DS90CR286 MTD56 (TSSOP) Package Pin Description — Channel Link Receiver Pin Name I/O No. GND I 5 Ground pins for TTL outputs. PLL Power supply for PLL. CC PLL GND I 2 Ground pin for PLL. LVDS Power supply pin for LVDS inputs. ...

Page 16

Applications Information technologies such as PECL. Surface mount resistors are recommended to avoid the additional inductance that ac- companies leaded resistors. These resistors should be placed as close as possible to the receiver input pins to reduce stubs and effectively ...

Page 17

Applications Information FIGURE 21. Single-Ended and Differential Waveforms (Continued) 17 DS012910-26 www.national.com ...

Page 18

... Physical Dimensions 64 ball, 0.8mm fine pitch ball grid array (FBGA) package www.national.com inches (millimeters) unless otherwise noted Order Number DS90CR285MTD or DS90CR286MTD NS Package Number MTD56 Dimensions shown in millimeters only Order Number DS90CR285SLC NS Package Number SLC64A 18 ...

Page 19

... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...

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